OS 10.13.6 Audacity version 2.2.2. I am new to Audacity and wish to split all tracks at the same precise point, but am having problems with the cursor. [How do I stop the green looping function from happening when I place my cursor in the top ruler area?] Looking for clear instructions to split and slide all tracks to a new position (leaving a gap).
That’s Timeline Quick-Play - it’s set “on” by default (it can be a very useful tool for finding pieces of audio - that’s why it’s on by default).
You can toggle that off/on by right clicking in the Timeline and disabling/enabling it.
See: https://manual.audacityteam.org/man/timeline.html
If you know the numeric time value you want then you can instead use the Selection Toolbar to set that value by typing it in the box(es).
See: https://manual.audacityteam.org/man/selection_toolbar.html
WC
@AMN - many thanks for nudging me to take a closer look at those two pages in the Manual - it made me realize that they were perhaps not as clear as they could be or should be in regard to what you were asking about.
Accordingly I spent some time this morning updating those pages in the alpha Manual for the upcoming Audacity 3.0.0.
Here is a preview for you:
https://alphamanual.audacityteam.org/man/Selection_Toolbar
https://alphamanual.audacityteam.org/man/Selection_Toolbar
Many thanks, 
Peter.
The current version of Audacity is 2.4.2. It is available via the Audacity website: Audacity ® | Download for Mac OS
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Click on the blue waveform in any audio track at the point that you wish to split.
(For greater precision, zoom in: Zooming Overview - Audacity Manual) -
“Select menu > Tracks > In All Tracks” (“Shift + Ctrl + K”) to extend to all tracks.
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“Edit menu > Clip Boundaries > Split” (“Ctrl + i”) to split.